/Engine/Source/Runtime/AIModule/Classes/BehaviorTree/BehaviorTreeManager.h
Get behavior tree template for given blueprint
bool LoadTree ( [UBehaviorTree](API\Runtime\AIModule\BehaviorTree\UBehaviorTree) & Asset, [UBTCompositeNode](API\Runtime\AIModule\BehaviorTree\UBTCompositeNode) *& Root, uint16 & InstanceMemorySize )